报告题目：Modifying gravity without extra degrees of freedom

报告人：高显 教授 （中山大学）

报告时间：2024年9月25日（周三）下午15:30-16:30

报告地点：北洋园校区49教410室

报告摘要：

The detection of gravitational waves (GWs) has provided us with a novel tool to test gravitational theories, which also raises a fundamental question: is General Relativity the unique theory for the two tensorial degrees of freedom (TTDOFs) associated with the GWs? In other words, is it possible to modify gravity without introducing any extra degree of freedom? In this talk, we will first introduce the motivation and previous attempts to build gravity theories with only the TTDOFs. We will then discuss our results in building such TTDOF theories in the framework of spatially covariant gravity, including: 1) the conditions for the Lagrangian to propagate only the TTDOFs, and 2) constructing the Hamiltonian directly with auxiliary constraints.

报告人简介：

高显，中山大学物理与天文学院教授，博士生导师。2010年博士毕业于中国科学院理论物理研究所，先后在法国巴黎第七大学、日本东京工业大学和东京大学从事博士后研究，2016年进入中山大学工作。主要研究方向为引力理论与宇宙学、引力波等。在国内外学术刊物发表学术论文50余篇，出版教材1部。现任中国物理学会引力与相对论天体物理分会委员。